Tailstock moving mechanism of numerical control lathe for machining cylinder sleeve of diesel engine of large steamship

Abstract

The utility model discloses a tailstock moving mechanism of a numerical control lathe for machining a cylinder sleeve of a diesel engine of a large steamship, which comprises a lathe body base. The base is mounted at the top of the lathe bed base; the mounting box body is fixedly mounted at the upper part of the base; the transmission mechanism is fixedly mounted in the mounting box body; the driving motor is fixedly mounted at the end part of the base and is used for driving the transmission mechanism; the transmission gear penetrates through the base and is connected with the output end of the transmission mechanism; and the rack is fixedly mounted at the top of the lathe bed base and is matched with the transmission gear. According to the utility model, the situation that the transmission accuracy is reduced and even fails due to relatively large abrasion or gluing between the worm and the worm gear is avoided, and the processing accuracy is ensured when a large-diameter workpiece is processed.

Description

Technical Field

[0001] The utility model belongs to the technical field of numerically controlled lathes, and in particular relates to a tailstock moving mechanism of a numerically controlled lathe for machining cylinder sleeves of large ship diesel engines. Background Art

[0002] The ship cylinder liner has a relatively large diameter (800-1200mm) and a relatively long length, generally 4-5m. During the production process, it needs to undergo a variety of machining operations. At this time, a large CNC lathe is needed. During the processing using a CNC lathe, the tailstock of the large CNC lathe moves on the lathe, and after reaching the predetermined position, the positioning is completed before the processing action is performed.

[0003] The utility model patent with domestic application number 201720731461.5 discloses a worm gear reducer, which solves the problem that the staff cannot disassemble the box body and the cover base without carrying the corresponding tools, resulting in the inability to timely oil filling. The key points of its technical solution are: an oil filling hole is set on the side of the box body away from the cover plate and on the side of the screw, and a sleeve is fixedly connected to the oil filling hole. A limit ring is set on the sleeve, and a placement groove for the limit ring is set on the box body, and a rotating column is threaded on the sleeve. A worm gear reducer of the utility model allows the staff to open the oil filling hole by hand and fill the oil when filling the worm gear. The existing base moving mechanism is driven by the driving member according to the position of the workpiece to be processed, so that the base position is moved. After moving to the specified position, the locking structure locks the base moving mechanism as a whole, and then the workpiece itself is processed by the processing part on the CNC lathe. The drive transmission structure is used in the process of base moving mechanism moving. The wear and aging of the drive transmission structure will lead to reduced transmission efficiency, and there is a situation that the transmission torque changes, so it causes an error in the position of the base movement, thereby causing the specified processing position of the workpiece to change, affecting the accuracy of workpiece processing. The above-mentioned utility model patent still has the situation that the gap between the worm and worm gear meshing contact surface is small, which is not convenient for the lubricating oil to contact the worm and worm gear meshing surface, and the rotation of the worm gear will generate centrifugal force, which will throw out the grease attached to the surface of the worm gear. The grease is attached to the surface of the worm gear for a short time and the attachment area is small, which affects the lubrication effect on the worm gear. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a tailstock moving mechanism for a CNC lathe for processing cylinder liners of large ship diesel engines, comprising a lathe bed base, and also comprising a base installed on the top of the lathe bed base, a mounting box fixedly installed inside the base, a transmission mechanism fixedly installed inside the mounting box, a drive motor fixedly installed at the end of the base for driving the transmission mechanism, a transmission gear that passes through the base and is connected to the output end of the transmission mechanism, and a rack fixedly installed on the top of the lathe bed base and matching the transmission gear.

[0005] As a further preferred technical solution of the utility model; a mounting groove is provided on the top of the base, a transmission groove is provided on one side of the mounting groove, a fixing groove is provided on one side of the transmission groove, a bearing seat is fixedly installed inside the fixing groove, the mounting box is fixedly installed inside the mounting groove, a ring frame is installed around the top of the mounting box, and the ring frame is clamped and fixed to the top of the mounting groove, oblique heat dissipation holes are provided on the inner walls on both sides of the mounting box, and a heat dissipation slope is provided on the base on one side of the mounting groove.

[0006] The installation box is placed into the installation groove through the ring frame clamping connection, and during the operation of the transmission mechanism inside the installation box, heat is dissipated through the oblique heat dissipation holes, and the heat dissipation area is increased through the heat dissipation inclined surface, thereby improving a certain heat dissipation effect.

[0007] As a further preferred technical solution of the utility model; the top of the base is used to limit and fix the installation box through a top cover, the top cover is provided with an oil filling hole, the inside of the installation box is provided with a worm groove and a worm wheel groove, the worm wheel groove is provided at the bottom of the worm groove, and the top and bottom of the worm wheel groove are both provided with curved surface parts.

[0008] When performing oiling maintenance on the inside of the mounting box, the transmission mechanism is oiled through the oiling hole. A portion of the lubricating oil flows from the side wall of the worm groove to the worm wheel groove and slowly flows from the inner wall of the curved surface, thereby increasing the flow area of ​​the lubricating oil inside the mounting cavity of the mounting box and ensuring comprehensive lubrication. The lubricating oil has a certain heat dissipation property and improves the heat dissipation effect on the transmission mechanism.

[0009] As a further preferred technical solution of the utility model; a waste chip trough is provided at the bottom of the installation box, a feed trough is provided at the bottom of the base to cooperate with the waste chip trough, and a dust collection box is fixedly installed at the bottom of the feed trough by bolts.

[0010] During the transmission process of the transmission mechanism, some friction waste chips will be generated, and the waste chips will be discharged from the waste chip trough and the feed trough, and collected and processed by the dust collecting box to ensure the smooth use of the transmission mechanism.

[0011] As a further preferred technical solution of the utility model, the transmission mechanism includes a worm installed in the worm groove, a worm wheel installed in the worm wheel groove and located at the bottom of the worm, one end of the worm wheel is fixedly installed with the inner wall of the installation box through a mounting bearing, and the other end of the worm wheel is connected and installed with the bearing seat through a transmission shaft. The other end of the bearing seat is fixedly installed with the connecting shaft and the transmission gear.

[0012] The worm is driven by a driving motor to rotate, so that the worm wheel meshing with the worm rotates, and the transmission shaft drives the transmission gear on the rack to transmit the transmission, so as to achieve the effect of moving the base on the lathe bed. The two axes of the worm and the worm wheel are usually staggered at an angle of 90°, and the meshing is line contact rather than point contact. Compared with the staggered axis helical gear mechanism, the structure is more compact, the transmission ratio is larger, and the load-bearing capacity is stronger; and compared with the chain transmission mechanism, the stability is stronger.

[0013] As a further preferred technical solution of the utility model; the worm and the worm wheel are meshingly driven, the worm is provided with a meshing portion, a thread ring is provided between the meshing portions, both sides of the thread ring are provided with a convex thread layer with the same spiral direction and angle, and an oil storage tank is provided between the convex thread layer and the thread ring. Conical blocks are welded and installed on both sides of the worm wheel, and a plurality of groups of meshing teeth are welded and installed on the outer circle of the worm wheel, and two groups of concave layers are provided on the meshing teeth, and a convex tooth end is provided at the end of the meshing tooth.

[0014] When the worm is rotated under force, centrifugal force will be generated. The setting of the convex thread layer makes it easier for the lubricating oil to slide from the convex surface to the oil storage tank when subjected to centrifugal force, thereby increasing the residence time of the lubricating oil on the outer ring of the worm. The setting of the tapered block makes it easier for the lubricating oil to flow to the connection between the transmission shaft and the tapered block, so that the transmission mechanism as a whole can be maintained. The setting of the concave layer makes it easier to lubricate the gap between the meshing teeth, thereby ensuring the stability of the transmission mechanism during transmission, reducing the dry friction between the worm and the worm wheel during operation due to lack of lubricating oil, and increasing the wear of the worm and the worm wheel. At the same time, the lubricating oil can also play a role in heat dissipation, effectively avoiding the bonding of the tooth surfaces of the worm and the worm wheel. Once the wear between the worm and the worm wheel is large or bonding occurs, the transmission accuracy will be reduced or even fail, thereby affecting the position of the workpiece moving on the base and reducing the accuracy of workpiece processing.

[0015] As a further preferred technical solution of the utility model, a mounting seat is fixedly installed at the bottom of the driving motor, and is fixedly installed to the side wall of the base through the mounting seat.

[0016] The drive motor is fixedly mounted on the base through the mounting base to ensure the stability of the drive motor.

[0017] Beneficial Effects

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. When the worm is rotated under force, centrifugal force will be generated. The setting of the convex thread layer makes it easier for the lubricating oil to slide from the convex surface to the oil storage tank when subjected to centrifugal force, thereby increasing the residence time of the lubricating oil on the outer ring of the worm. The setting of the tapered surface block makes it easier for the lubricating oil to flow to the connection between the transmission shaft and the tapered surface block, so that the transmission mechanism as a whole can be maintained. The setting of the concave surface layer makes it easier to lubricate the gap between the meshing teeth, thereby ensuring the stability of the transmission mechanism during transmission, reducing the dry friction between the worm and the worm wheel during operation due to lack of lubricating oil, and ensuring the lubrication and maintenance of the worm and the worm wheel.

[0020] 2. Lubricating oil can also play a role in heat dissipation. It contacts with the surface of the worm and worm wheel to achieve heat dissipation. It dissipates heat through the oblique heat dissipation holes. The heat dissipation area is increased by the heat dissipation slope, which improves the heat dissipation effect to a certain extent and effectively avoids the bonding of the worm and worm wheel tooth surfaces. Once the worm and worm wheel are worn out or bonded, the transmission accuracy will be reduced or even fail, which will affect the position of the workpiece moving on the base and reduce the accuracy of workpiece processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a top-view cross-sectional structure of the utility model applied to a tailstock;

[0022] Figure 2 For this utility model Figure 1 A schematic diagram of a side cross-sectional structure;

[0023] Figure 3 This is a schematic diagram of the connection structure of the transmission gear in the utility model;

[0024] Figure 4 For this utility model Figure 3 A schematic cross-sectional structure diagram of ;

[0025] Figure 5 It is a schematic diagram of the cross-sectional structure of the installation box in the utility model;

[0026] Figure 6 It is a schematic diagram of the installation structure of the transmission mechanism in the utility model;

[0027] Figure 7 It is a schematic diagram of the meshing structure of the worm gear in the utility model;

[0028] Figure 8 It is an enlarged structural schematic diagram of the meshing teeth in the utility model.

[0029] In the figure: 1. base; 11. lathe bed base; 12. rack; 13. top cover; 14. oil filling hole; 15. transmission groove; 16. feeding groove; 17. mounting groove; 18. heat dissipation slope; 19. fixing groove; 2. transmission mechanism; 21. worm; 211. meshing part; 212. convex thread layer; 213. thread ring; 214. oil storage tank; 22. worm wheel; 221. meshing teeth; 222. concave layer; 223. convex tooth end; 23. cone block; 24. transmission shaft; 25. mounting bearing; 26. bearing seat; 3. transmission gear; 31. connecting shaft; 4. mounting box; 41. waste chip groove; 42. ring frame; 43. worm groove; 44. worm wheel groove; 45. curved part; 46. oblique heat dissipation hole; 5. driving motor; 51. mounting seat; 6. dust collecting box. DETAILED DESCRIPTION

[0030] The specific implementation method is a tailstock moving mechanism for a CNC lathe used for machining cylinder liners of large ship diesel engines.

[0031] The existing base moving mechanism is driven by a driving member according to the position of the workpiece to be processed, so that the base position moves. After moving to the specified position, the locking structure locks the entire base moving mechanism, and then the workpiece itself is processed by the processing parts on the CNC lathe. When the driving transmission structure is used, the transmission efficiency will be reduced once the driving transmission structure is worn and aged during the movement of the base moving mechanism, and there is a situation where the transmission torque changes, so the position of the base movement is affected by errors, thereby causing the specified processing position of the workpiece to change, affecting the accuracy of the workpiece processing, and reducing the processing efficiency of the workpiece. The gap between the meshing contact surface of the worm and worm gear is small, which is not convenient for the lubricating oil to contact the meshing surface of the worm and worm gear. The rotation of the worm and worm gear will generate centrifugal force, which will throw out the grease attached to the surface of the worm and worm gear. The grease is attached to the surface of the worm and worm gear for a short time and the attachment area is small, which affects the lubrication effect on the worm and worm gear.

[0032] Its structural diagram is as follows Figure 1-Figure 2 The tailstock moving mechanism of a CNC lathe for processing cylinder sleeves of large ship diesel engines comprises a lathe bed base 11, a base 1 mounted on the top of the lathe bed base 11, a mounting box 4 fixedly mounted inside the base 1, a transmission mechanism 2 fixedly mounted inside the mounting box 4, a driving motor 5 fixedly mounted at the end of the base 1 for driving the transmission mechanism 2, a transmission gear 3 penetrating the base 1 and connected to the output end of the transmission mechanism 2, and a rack 12 fixedly mounted on the top of the lathe bed base 11 and matched with the transmission gear 3.

[0033] like Figure 3-Figure 5As shown, a mounting groove 17 is provided on the top of the base 1, a transmission groove 15 is provided on one side of the mounting groove 17, a fixing groove 19 is provided on one side of the transmission groove 15, a bearing seat 26 is fixedly installed inside the fixing groove 19, the mounting box 4 is fixedly installed inside the mounting groove 17, a ring frame 42 is installed around the top of the mounting box 4, and the ring frame 42 is clamped and fixed with the top of the mounting groove 17, oblique heat dissipation holes 46 are provided on the inner walls on both sides of the mounting box 4, and a heat dissipation slope 18 is provided on the base 1 on one side of the mounting groove 17. The mounting box 4 is clamped and placed into the mounting groove 17 through the ring frame 42, and during the operation of the transmission mechanism 2 inside the mounting box 4, heat is dissipated through the oblique heat dissipation holes 46, and the heat dissipation slope 18 increases the heat dissipation area, thereby improving a certain heat dissipation effect.

[0034] The top of the base 1 is fixed to the mounting box 4 by the top cover 13, and the top cover 13 is provided with an oil filling hole 14. The mounting box 4 is provided with a worm groove 43 and a worm wheel groove 44. The worm wheel groove 44 is provided at the bottom of the worm groove 43, and the top and bottom of the worm wheel groove 44 are provided with a curved surface 45. When the inside of the mounting box 4 is oiled for maintenance, the transmission mechanism 2 is oiled through the setting of the oil filling hole 14, and a part of the lubricating oil flows from the side wall of the worm groove 43 to the worm wheel groove 44, and flows slowly from the inner wall of the curved surface 45, increasing the flow area of ​​the lubricating oil inside the mounting cavity of the mounting box 4, ensuring the comprehensiveness of lubrication, and the lubricating oil has a certain heat dissipation, while improving the heat dissipation effect of the transmission mechanism 2.

[0035] A waste chip groove 41 is provided at the bottom of the mounting box 4, a material discharge groove 16 is provided at the bottom of the base 1 to match the waste chip groove 41, and a dust collecting box 6 is fixedly installed at the bottom of the material discharge groove 16 by bolts. During the transmission process of the transmission mechanism 2, a part of friction waste chips will be generated, and the waste chips are discharged from the waste chip groove 41 and the material discharge groove 16, and collected and processed by the dust collecting box 6, so as to ensure the smooth use of the transmission mechanism 2.

[0036] like Figure 6-Figure 8As shown, the transmission mechanism 2 includes a worm 21 installed inside the worm groove 43, a worm wheel 22 installed inside the worm wheel groove 44 and located at the bottom of the worm 21, one end of the worm wheel 22 is fixedly installed with the inner wall of the mounting box 4 through the mounting bearing 25, and the other end of the worm wheel 22 is connected and installed with the bearing seat 26 through the transmission shaft 24. The other end of the bearing seat 26 is fixedly installed through the connecting shaft 31 and the transmission gear 3. The worm 21 is driven to rotate by the driving motor 5, so that the worm wheel 22 meshing with the worm 21 rotates, and the transmission shaft 24 drives the transmission gear 3 to transmit on the rack 12, so as to achieve the effect of the base 1 moving on the lathe bed machine base 11. The two axes of the worm 21 and the worm wheel 22 are usually staggered at an angle of 90°, and the meshing is line contact rather than point contact. Compared with the staggered axis helical gear mechanism, the structure is more compact, the transmission ratio is larger, and the load-bearing capacity is stronger; and compared with the chain-type transmission mechanism, the stability is stronger.

[0037] The worm 21 and the worm wheel 22 are meshed for transmission. The worm 21 is provided with a meshing portion 211, and threaded rings 213 are provided between the meshing portions 211. Both sides of the threaded rings 213 are provided with convex threaded layers 212 with the same spiral direction and angle, and an oil storage tank 214 is provided between the convex threaded layers 212 and the threaded rings 213. Conical blocks 23 are welded and installed on both sides of the worm wheel 22, and multiple groups of meshing teeth 221 are welded and installed on the outer circle of the worm wheel 22. Two groups of concave layers 222 are provided on the meshing teeth 221, and convex tooth ends 223 are provided at the ends of the meshing teeth 221.

[0038] When the worm 21 is rotated under force, centrifugal force is generated, and the setting of the convex thread layer 212 facilitates the lubricating oil to slide from the convex surface to the oil storage tank 214 when subjected to centrifugal force, thereby increasing the residence time of the lubricating oil on the outer ring of the worm 21. The setting of the conical block 23 facilitates the lubricating oil to flow to the connection between the transmission shaft 24 and the conical block 23, so that the transmission mechanism 2 can be maintained as a whole. The setting of the concave layer 222 facilitates lubrication of the gap between the meshing teeth 221, thereby ensuring the stability of the transmission mechanism 2 during the transmission process, reducing the dry friction between the worm 21 and the worm wheel 22 during operation due to lack of lubricating oil, and increasing the wear of the worm 21 and the worm wheel 22. At the same time, the lubricating oil can also play a heat dissipation role, effectively avoiding the bonding of the tooth surfaces of the worm 21 and the worm wheel 22. Once the wear between the worm 21 and the worm wheel 22 is large or bonding occurs, the transmission accuracy will be reduced or even fail, thereby affecting the position of the workpiece moving on the base 1 and reducing the accuracy of workpiece processing. A mounting seat 51 is fixedly installed at the bottom of the driving motor 5 , and the mounting seat 51 is fixedly installed with the side wall of the base 1 . The mounting seat 51 is used to fix the driving motor 5 and the base 1 , thereby ensuring the stability of the driving motor 5 .

[0039] All technical features in this embodiment can be freely combined according to actual needs.

[0040] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A tailstock moving mechanism for a CNC lathe for machining cylinder liners of large ship diesel engines, comprising a lathe bed frame (11), characterized in that: The invention also comprises a base (1) mounted on the top of the lathe bed base (11), a mounting box (4) fixedly mounted on the top of the base (1), a transmission mechanism (2) fixedly mounted inside the mounting box (4), a drive motor (5) fixedly mounted at the end of the base (1) for driving the transmission mechanism (2), a transmission gear (3) passing through the base (1) and connected to the output end of the transmission mechanism (2), and a rack (12) fixedly mounted on the top of the lathe bed base (11) and cooperating with the transmission gear (3).

2. The tailstock moving mechanism of a CNC lathe for machining cylinder liners of large ship diesel engines according to claim 1 is characterized in that: The base (1) is provided with a mounting groove (17) at the top, a transmission groove (15) is provided at one side of the mounting groove (17), a fixing groove (19) is provided at one side of the transmission groove (15), a bearing seat (26) is fixedly installed inside the fixing groove (19), the mounting box (4) is fixedly installed inside the mounting groove (17), a ring frame (42) is installed around the top of the mounting box (4), and the ring frame (42) is fixedly connected to the top of the mounting groove (17), oblique heat dissipation holes (46) are provided on the inner walls of both sides of the mounting box (4), and a heat dissipation inclined surface (18) is provided on the base (1) at one side of the mounting groove (17).

3. The tailstock moving mechanism of a CNC lathe for machining cylinder liners of large ship diesel engines according to claim 2 is characterized in that: The top of the base (1) is used to position and fix the mounting box (4) through a top cover (13); an oil filling hole (14) is provided on the top cover (13); a worm groove (43) and a worm wheel groove (44) are provided inside the mounting box (4); the worm wheel groove (44) is provided at the bottom of the worm groove (43); and curved surface parts (45) are provided around the top and bottom of the worm wheel groove (44).

4. The tailstock moving mechanism of a CNC lathe for machining cylinder liners of large ship diesel engines according to claim 3 is characterized in that: The bottom of the installation box (4) is provided with a waste chip groove (41), the bottom of the base (1) is provided with a material discharge groove (16) in coordination with the waste chip groove (41), and a dust collection box (6) is fixedly installed at the bottom of the material discharge groove (16) by means of bolts.

5. The tailstock moving mechanism of a CNC lathe for machining cylinder liners of large ship diesel engines according to claim 4, characterized in that: The transmission mechanism (2) comprises a worm (21) installed inside the worm groove (43), and a worm wheel (22) installed inside the worm wheel groove (44) and located at the bottom of the worm (21); one end of the worm wheel (22) is fixedly mounted to the inner wall of the mounting box (4) via a mounting bearing (25); the other end of the worm wheel (22) is connected to the bearing seat (26) via a transmission shaft (24); and the other end of the bearing seat (26) is fixedly mounted to the transmission gear (3) via a connecting shaft (31).

6. The tailstock moving mechanism of a CNC lathe for machining cylinder liners of large ship diesel engines according to claim 5, characterized in that: The worm (21) and the worm wheel (22) are meshed for transmission. A meshing portion (211) is provided on the worm (21). A threaded ring (213) is provided between the meshing portions (211). Both sides of the threaded ring (213) are provided with convex threaded layers (212) with the same spiral direction and angle. An oil storage tank (214) is provided between the convex threaded layer (212) and the threaded ring (213). Conical blocks (23) are welded and installed on both sides of the worm wheel (22). A plurality of groups of meshing teeth (221) are welded and installed on the outer circle of the worm wheel (22). Two groups of concave layers (222) are provided on the meshing teeth (221). The ends of the meshing teeth (221) are provided with convex tooth ends (223).

7. The tailstock moving mechanism of a CNC lathe for machining cylinder liners of large ship diesel engines according to claim 1 is characterized in that: A mounting seat (51) is fixedly mounted on the bottom of the driving motor (5), and is fixedly mounted to the side wall of the base (1) via the mounting seat (51).

Images